Hi Jim,
On 08/02/2017 03:04 PM, jimlux wrote:
On 8/2/17 5:16 AM, Magnus Danielson wrote:
BTW, I saw that the JPL receiver at ISS got upgraded to support Galileo.
Cool stuff.
well, not exactly upgraded - the hardware didn't change - being bolted
to the exterior of ISS inside a box inside
On 8/2/17 5:16 AM, Magnus Danielson wrote:
BTW, I saw that the JPL receiver at ISS got upgraded to support Galileo.
Cool stuff.
well, not exactly upgraded - the hardware didn't change - being bolted
to the exterior of ISS inside a box inside a box - it was a software
change - which is
On 08/02/2017 01:20 AM, jimlux wrote:
On 8/1/17 12:11 PM, Graham / KE9H wrote:
Dider:
This is a CDMA signal. (With a 'chip' rate that far exceeds the
information
rate.)
If you put a different correlator on every multipath signal, which are
each
differently delayed in time, then they can be
On 8/1/17 12:11 PM, Graham / KE9H wrote:
Dider:
This is a CDMA signal. (With a 'chip' rate that far exceeds the information
rate.)
If you put a different correlator on every multipath signal, which are each
differently delayed in time, then they can be independently demodulated.
(Or time
On 8/1/17 11:11 AM, Didier Juges wrote:
"The newer the receiver, the more horsepower in the silicon. In the case of
GPS, that
gives you more correlators to do DSP. The sensitivity improvement is a
direct result
of that. If you take a look at the guts of a TBolt, they date to the late
1990’s.
" having around 20 dB of gain at the antenna greatly decreases the effect
of feed line loss on noise figure."
And that would be consistent with usage for a timing receiver which is
expected to have a well exposed antenna and a significant line length, as
opposed to navigation receivers where the
Dider:
This is a CDMA signal. (With a 'chip' rate that far exceeds the information
rate.)
If you put a different correlator on every multipath signal, which are each
differently delayed in time, then they can be independently demodulated.
(Or time shifted and added back together with some
"The newer the receiver, the more horsepower in the silicon. In the case of
GPS, that
gives you more correlators to do DSP. The sensitivity improvement is a
direct result
of that. If you take a look at the guts of a TBolt, they date to the late
1990’s. That’s
a long time in silicon years …."
It
Hi Jerry:
The Trimble is the oldest mass produced GPS receiver I know of and because the early receivers used high gain antennas
it seems that Trimble kept that idea for the newer designs. They like about 41 dB gain between the antenna and the input
to the receiver.
Hi
> On Jul 31, 2017, at 3:32 PM, Didier Juges wrote:
>
> The Thunderbolt is well known for not having the best sensitivity among GPS
> receivers. It seems that timing receivers in general, particularly those of
> the same generation as the Thunderbolt are not as sensitive
The Thunderbolt is well known for not having the best sensitivity among GPS
receivers. It seems that timing receivers in general, particularly those of
the same generation as the Thunderbolt are not as sensitive as navigation
(possibly newer) GPS receivers. It may be because they are expected to
Hello Jerry,
I think the problem is not at the antenna, I consider the 58532A to be a
lot better than these smal patch antennas.
But the point is that modern receivers have a significant better sensivity!
In my opinion, indoor position of any kind of antenna is not a good
solution if you want to
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